import { defineStore } from "pinia";
import { ref } from "vue";


const STORAGE_KEY='user_data'
const DEFAULT_ADMIN = {
    id: 'admin',
    username: 'admin',
    password: 'admin123',
    role: 'admin',
    name: '系统管理员'
}

const loadUsers = () => {
    const storeData = localStorage.getItem(STORAGE_KEY)
    const users = storeData ? JSON.parse(storeData) : []

    if(!users.some(user => user.role === 'admin')) {
        users.push(DEFAULT_ADMIN)
        saveUsers(users)
    }

    return users
}

const saveUsers = (users) => {
    localStorage.setItem(STORAGE_KEY,JSON.stringify(users))
}
export const useMemberStore = defineStore('member', ()=> {
    const users = ref(loadUsers());

    const addUser = (user) => {
        user.id = Date.now();
        if (user.role === 'teacher') {
            user.subjects = []
        }
        user.grades = {
            frontend: null,
            english:null,
            python:null,
        };
        users.value.push(user);
        saveUsers(users.value)
    }

    const updateUser = (id, updatedInfo) => {
        const user = users.value.find((u)=> u.id === id) 
        if (user) {
            Object.assign(user, updatedInfo)
            saveUsers(users.value)
        }
    }
    const updateStudentGrades = (id,grades) => {
        const student = users.value.find((u) => u.id === id && u.role === 'student');
        if(student) {
            student.grades = {...student.grades, ...grades}
            saveUsers(users.value)
        }
    }

    const getUserById = (id) => {
        return users.value.find((s) => s.id === id)
    }

    const getUserByUsername = (username) => {
        return users.value.find((s) => s.username === username)
    }

    const deleteUser = (id) => {
        users.value = users.value.filter((u) => u.id !== id)
        saveUsers(users.value)
    }
    const getAllStudents = () => {
        return users.value.filter((u) => u.role === 'student')
    }
    const updateTeacherSubjects = (id,subjects) => {
        const teacher = users.value.find((u) => u.id && u.role === 'teacher' )
        if(teacher) {
            teacher.subjects = subjects
            saveUsers(users.value)
        }
    }
    
    return {users, 
            addUser, 
            getUserById, 
            getUserByUsername,
            deleteUser,
            getAllStudents,
            updateStudentGrades,
            updateTeacherSubjects
        }
})